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Siemens 3RU21364HB0 overload relay, grey industrial housing, three terminals, S2 frame

SIEMENS

SIEMENS 3RU21364HB0 Overload Relay 40-50A Trip Class 10 3-Pole S2

SKU CH-WSN0-125YE

Protects 3RT203 contactors with 40-50 A trip range and class 10 response

  • Protects motors with 40 to 50A overload range
  • Matches Trip Class 10 response requirements
  • Works with 3RT203 contactor series
  • Three-pole design handles three-phase circuits
  • Auto and manual reset modes available

Application & Use

The SIEMENS 3RU21364HB0 is a 3-pole overload relay rated for 40 to 50A with Trip Class 10. It provides motor protection for industrial control circuits using S2 frame dimensions. Suitable for maintenance engineers and panel builders wiring new starters.

Compatibility Check

Verify that the existing contactor belongs to the 3RT203 series before ordering. Confirm the motor full-load current falls within the 40 to 50A range and that the Trip Class 10 characteristic matches the application requirements. Ensure the control panel has space for an S2 frame device.

Reset & Operation

The relay offers both auto and manual reset modes, allowing operators to choose automatic restart or deliberate acknowledgement after a trip. This flexibility reduces unplanned downtime on production lines while maintaining safety compliance for critical machinery.

Highlights

  • Protects motors with 40 to 50A overload range
  • Matches Trip Class 10 response requirements
  • Works with 3RT203 contactor series
  • Three-pole design handles three-phase circuits
  • Auto and manual reset modes available

Specifications

BrandSIEMENS

Questions about this item

Does the SIEMENS 3RU21364HB0 overload relay include a contactor or must the 3RT203 series contactor be purchased separately?

The relay is designed for use with the 3RT203 series contactors which are sold separately.

How do I decide whether the 40 to 50A current range suits my motor?

Select this relay when the motor full-load current falls between 40 and 50A; the trip class 10 characteristic provides standard protection for typical starting times.

What does trip class 10 mean for day-to-day operation of the 3RU21364HB0?

Trip class 10 means the relay will trip within 10 seconds at 7.2 times the set current, giving standard overload protection for motors with normal acceleration.

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